Removable core lock



Feb. 20, 1934. r. BARGMAN 1,947,443

REuovABLE GORE Loox Filed March 25, 1929 A will ATTOR N EYS Patented Feb. 20, 1934 UNITED STATES PATENT OFFICE 1 Claim.

The present invention pertains to a novel lock construction having a core that is removable and interchangeable at will. In addition to this core there is a separate and permanent core or cylin- 5 der for retaining the first named core in place.

It often becomes necessary in apartment houses, hotels and the like, 'due to the conduct of the tenants, to change the door lock. The object of the present invention is to meet this situation i without the necessity of dismantling the lock to any considerable extent and without the possi bility of the lock being dismantled by unauthorized persons with the use of ordinary tools.

Accordingly, the present invention includes a lock case mounted in the door in the usual manner and receiving a readily removable main core or cylinder. An auxiliary lock is also mounted in the case and is provided with a key controlled member adapted to positively hold the main lock in the case or to release it so that it may readily be withdrawn. The auxiliary lock is, however, permanently held in the case. The invention is also applicable to padlocks and other forms of locks as will appear further in the description.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing in Which- Figure 1 is a cross section of a door, showing the lock inside;

Fig. 2 is a front elevation of the lock;

Fig. 3 is a diametrical section thereof;

Fig. 4 is -a section on the line 4 4 of Fig. 3;

Fig. 5 is a section on the line 5-5 of Fig. 3;

Fig. 6 is a perspective view of the main core;

Fig. 7 is an elevation of a padlock, with one of the body sections removed, equipped according to the invention; and

Fig. 8 is a bottom plan view thereof.

Reference to these views will now be had by the use of like characters which are employed to designate corresponding parts throughout.

In Fig. 1 the lock of this invention is shown as applied to a swinging door 1 which closes against one of the sides 2 of the door frame. On the inner wall the door carries a latch housn ing 3 containing a spring pressed latch 4 adapted to enter a keeper 5 on the door frame. The latch is operable manually at the casing 3 by means of a knob 6, and inasmuch as this structure is conventional, no further description thereof is deemed necessary.

The door 1 has an opening 7 for receiving a lock case 8. The face of this member is exposed at the outer side of the door and is formed with a iiange 9 seated in a ring 10 of angular cross sec,-

tion at the margin ci the opening 7. Over the inner end of the opening 7 is laid a plate 11 concealed within the housing 3, and screws 12 having their heads anchored and countersunk in the plate are threaded into the case 8 to draw the 60 saine rmly against the ring 10. It will thus be seen that the case cannot be removed except from the inner side of the door and then only when the casing 3 is removed.

The case 8 has a longitudinal cavity 13 of such G5. size as to receive a core consisting of a cylindrical portion 14 and a depending tumbler containing portion 15. At the rear end of the member 15 is a ledge 16 and at the lower edge is another ledge 17 for a purpose which will presently 7o: appear.

The cylindrical portion 14 receives a conventional plug 18 having a key slot 19 adapted to receive a key 20 for co-operating with spring pressed tumblers 21 in the member l5 in a manner which 75 is already well known in the art. The plug is extended somewhat beyond the rear or inner end of the core, as indicated by the numeral 22, and on this extension is threaded a collar 23 which has one end abutting the core and the other end formed with arcuate notches 24. The extension 22 is slotted at 25 to receive one end of a link 26. The last named end has a notch 27 adapted to receive a screw 28 threaded into the extension 22 and having its head accommodated in one of 85 the notches 24. The link 23 passes through an aperture 29 in the plate 11 and then connects with the bolts 4 in order to actuate the same when the proper key 20 is inserted in the key slot 19 and turned, as already well known in the art.

The case 8l has another longtudinal cavity 30 for receiving a core 31 with a tumbler receiving portion 32. In the core 31 is a conventional rotatable plug 33. It will be seen in Fig. 3 that the case 8 is formed on its face with an inwardly g5 extending ilange 34 at the forward end of the cavity 39 and that the forward end of the core 31 is engaged by the flange 34 which also engages the protruding forward end of the plug. The auxiliary core 31 must therefore be inserted 100 through the back of the case 8 and cannot be withdrawn from the front end thereof. The core 3l is shorter than the core 14, and the rear end of the plug 33 carries an extension member or latch 35 adapted to be turned into engagement with 105 the shoulder 16 and limted in its downward movement on the shoulder 17, by the use of the proper key in the key slot 35 formed in the plug 33. When the member 35 is in this position, the main core 14 is positively held in the case 8, but when H0 the member 35 is retracted from the shoulders 16 and 17, the main core may readily be withdrawn through the face of the case 8. In this manner, the main core 14 may be replaced by another of like dimensions but of a different combination when desired merely by the operation of the lock comprised in the core 31, 32. In a series of these locks, the auxiliary cores may be identical so that they may be controlled by a single master key in the possession of the person authorized to change the main cores 14. through the side Wall of the case 8 engages the member 32 and prevents it from being turned with the plug 34. Both cavities 13 and 30 are closed at the rear end by a cover plate 38 secured to the case and having an inward abutment 39 engaging the locking member 35 as shown in Fig. 5.

The invention is also applicable to padlocks as shown in Figs. 7 and 8 Where the padlock body consists of half sections 4 9 held together by rivets 41. At one end of the body is journaled a shackle 42 With a hook end 43 entering a notch 44C in the other end of the body. A spring pressed bolt 45 slides in the upper part of the body and is adapted to enter the notched end 43. A main lock or core 46 is permanently held in the body and equipped A set screw 37 enteredwith a rotatable key controlled plug 47 which has at its inner end a cam 48 adapted to actuate the bolt 45 as well known. In addition to the main lock, the body contains an auxiliary plug 49 having an extension 50 adapted to engage and disengage the core 4.5 in the manner already described in connection with Figs. 1 to 6.

Although specific embodiments of the invention have been illustrated and described, it Will be understood that various alterations in the details of construction may be made Without departing from the scope of the invention as indicated by the appended claim.

What I claim is:-

In cylinder lock construction and in combination, a iock casing, a removable unit carried thereby consisting or" the key plug and tumbler casing, said unit being held against bodily rotation, a second key-operated plug secured in the lock casing, said key plugs being rotatable on substantially parallel axes, an element carried by said second key plug and movable into and out of engagement with the unit by rotation of the second key plug, said element in one position being active to prevent removal of the unit.

THEODORE BARGMAN. 

